Passage
Yahweh will keep your going out and your coming in, from this time forward, and forever more.
Yahweh will keep your going out and your coming in, from this time forward, and forever more.
Psalms 121:6 The sun will not harm you by day, nor the moon by night.
Psalms 121:7 Yahweh will keep you from all evil. He will keep your soul.
Psalms 121:8 Yahweh will keep your going out and your coming in, from this time forward, and forever more.
The verse centers on "yahweh", "keep", "going", "coming", "time", "forward", and "forever". It is saying that the verse draws attention to "yahweh" and "keep", so its meaning should be read from those terms before moving to application.
The prior verse says "Yahweh will keep you from all evil...", giving immediate footing for "yahweh" and "keep". In Psalms context, the local focus is worship, trust, the LORD's kingship, and covenant mercy.
A plain takeaway is to answer the verse's own emphasis on "yahweh" and "keep" with trust shaped by these words, not by a vague optimism outside the passage.